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Partial fix for background images on wikipedia pages.

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This fixes the visual artifacts seen at the top of wikipedia pages by:
 - Setting clipping rect to avoid images going outside their bounds.
 - Handling case of background-position being >= 100% such that wrapping is required.

However, the gradient is not currently visible on wikipedia. This relies on bug #1997 being fixed.
This commit is contained in:
Glenn Watson 2014-09-11 12:04:20 +10:00
parent 1124430eea
commit 29c3819246
5 changed files with 102 additions and 25 deletions
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84
components/layout/fragment.rs
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@ -719,44 +719,78 @@ impl Fragment {
let vertical_position = model::specified(background.background_position.vertical,
bounds.size.height);
let clip_display_item;
// TODO: These are some situations below where it is possible
// to determine that clipping is not necessary - this is an
// optimization to make in the future.
let clip_display_item = Some(box ClipDisplayItem {
base: BaseDisplayItem::new(bounds, self.node, level),
children: DisplayList::new(),
});
let image_width = Au::from_px(image.width as int);
let image_height = Au::from_px(image.height as int);
match background.background_attachment {
background_attachment::scroll => {
clip_display_item = None;
bounds.origin.x = bounds.origin.x + horizontal_position;
bounds.origin.y = bounds.origin.y + vertical_position;
bounds.size.width = bounds.size.width - horizontal_position;
bounds.size.height = bounds.size.height - vertical_position;
// Adjust sizes for `background-repeat`.
match background.background_repeat {
background_repeat::no_repeat => {
bounds.size.width = Au::min(bounds.size.width - horizontal_position, image_width);
bounds.size.height = Au::min(bounds.size.height - vertical_position, image_height);
}
background_repeat::repeat_x => {
bounds.size.height = Au::min(bounds.size.height - vertical_position, image_height);
if horizontal_position > Au(0) {
bounds.origin.x = bounds.origin.x - image_width;
bounds.size.width = bounds.size.width + image_width;
}
}
background_repeat::repeat_y => {
bounds.size.width = Au::min(bounds.size.width - horizontal_position, image_width);
if vertical_position > Au(0) {
bounds.origin.y = bounds.origin.y - image_height;
bounds.size.height = bounds.size.height + image_height;
}
}
background_repeat::repeat => {
if horizontal_position > Au(0) {
bounds.origin.x = bounds.origin.x - image_width;
bounds.size.width = bounds.size.width + image_width;
}
if vertical_position > Au(0) {
bounds.origin.y = bounds.origin.y - image_height;
bounds.size.height = bounds.size.height + image_height;
}
}
};
}
background_attachment::fixed => {
clip_display_item = Some(box ClipDisplayItem {
base: BaseDisplayItem::new(bounds, self.node, level),
children: DisplayList::new(),
});
bounds = Rect {
origin: Point2D(horizontal_position, vertical_position),
size: Size2D(bounds.origin.x + bounds.size.width,
bounds.origin.y + bounds.size.height),
}
};
// Adjust sizes for `background-repeat`.
match background.background_repeat {
background_repeat::no_repeat => {
bounds.size.width = image_width;
bounds.size.height = image_height;
}
background_repeat::repeat_x => {
bounds.size.height = image_height;
}
background_repeat::repeat_y => {
bounds.size.width = image_width;
}
background_repeat::repeat => {}
};
}
}
// Adjust sizes for `background-repeat`.
match background.background_repeat {
background_repeat::no_repeat => {
bounds.size.width = Au::from_px(image.width as int);
bounds.size.height = Au::from_px(image.height as int)
}
background_repeat::repeat_x => {
bounds.size.height = Au::from_px(image.height as int)
}
background_repeat::repeat_y => {
bounds.size.width = Au::from_px(image.width as int)
}
background_repeat::repeat => {}
};
// Create the image display item.
let image_display_item = ImageDisplayItemClass(box ImageDisplayItem {
base: BaseDisplayItem::new(bounds, self.node, level),